JP3076716B2 - Digital mobile radio equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital mobile radio device such as a portable radio telephone for controlling power consumption reduction based on a voice signal.

[0002]

2. Description of the Related Art FIG. 2 is a block diagram showing the configuration of a conventional digital mobile radio device such as a portable radio telephone. A / D converter 2 for converting to an audio signal, connected to A / D converter 2, for encoding a digital audio signal and connected to audio encoding unit 4 for outputting encoded audio data, and audio encoding unit 4 A transmitting unit 5 for frequency-modulating the encoded voice data into a radio frequency band and outputting the modulated data from an antenna 6 is connected.

Similarly, the control unit 12 includes an antenna 6
, A receiving unit 7 that converts the signal received in the baseband, demodulates and outputs coded voice data, is connected to the receiving unit 7, decodes the coded voice data into a digital voice signal, and a voice. A D / A converter 10 that is connected to the decoding unit 8, converts a digital audio signal into an analog audio signal, and outputs it to an output terminal 11 is connected.

Further, the control unit 12 includes an A / D converter 2
And the input terminal 1 has no audio input,
When detecting a silence state in which only surrounding low-level noise is input, a transmission silence detection unit 3 that outputs a stop signal is connected, and the transmission silence detection unit 3 includes a speech encoding unit 4 and a transmission unit 5. Connected to

Next, the operation of the conventional digital mobile radio apparatus having such a configuration will be described. During a normal call, the voice emitted by the user is input from the input terminal 1, converted into a digital voice signal by the A / D converter 2, and then converted into coded voice data by the voice coder 4, and is coded. The audio data is frequency-modulated to a radio frequency band by the transmission unit 5 and output from the antenna 6. On the other hand, the radio wave received by the antenna 6 is demodulated into encoded audio data by the receiving unit 7, decoded into a digital audio signal by the audio decoding unit 8,
The signal is converted into an analog audio signal by the / A converter 10 and output.

However, in a silent state in which the user is listening to the other party even during communication, and only low-level ambient noise is input to the input terminal 1, the transmission silent state detecting unit 3 sets the silent state. From the transmission silence detection unit 3 to the speech encoding unit 4 and the transmission unit 5 according to a command from the control unit 12.
A stop signal is input to the switch. As described above, when the stop signal is input from the transmission silence detection unit 3, the speech encoding unit 4 and the transmission unit 5 are in an operation stop state. Then, when the voice signal of the user is inputted to the input terminal 1, the transmission silence detecting section 3 detects the voice state, and the voice from the transmission silence detecting section 3 is instructed by the control section 12. The supply of the stop signal to the encoder 4 and the transmitter 5 is cut off.

[0007] When the operation of the voice encoding unit 4 and the transmitting unit 5 is stopped in a silent state in which the user is not talking, the surrounding noise is not transmitted to the partner terminal, but the reception from the partner terminal is not performed. The communication using the digital mobile radio apparatus does not cause any trouble, and in this case, when the user starts talking, the operations of the voice encoding unit 4 and the transmitting unit 5 are restarted. By this operation, useless power consumption in the voice encoding unit 4 and the transmission unit 5 is prevented, and the operating power consumption of the digital mobile radio device can be reduced.

[0008]

In the above-mentioned conventional digital mobile radio apparatus, a sound state and a silent state are discriminated based on the level of a sound signal input to the input terminal 1, and the user emits a sound. When there is no sound, it is determined that there is no sound when the surrounding noise level is low, and there is no problem.However, when the user does not emit sound and when the surrounding noise level is high, it is determined that there is sound. Audio encoding unit 4 and transmitting unit 5
Does not stop. For this reason, the surrounding noise is converted into coded voice data by the voice coding unit 4, and the coded voice data is frequency-modulated to a radio frequency band by the transmission unit 5 and output from the antenna 6. Power is consumed, and power consumption is not reduced in the sound state.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem in the conventional digital mobile radio apparatus, and has an object to solve the problem even in a sound state where the input voice level is high.
It is an object of the present invention to provide a digital mobile radio device capable of preventing power from being wasted.

[0010]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides an analog / digital converter for converting an analog audio signal into a digital audio signal, and a digital converter converted by the analog / digital converter. Encoding means for encoding the audio signal and outputting encoded audio data;
A transmitting means for modulating the coded voice data output from the coding means, converting the coded voice data to a radio frequency and outputting from the antenna, and converting a signal received by the antenna to baseband and demodulating the coded voice data; Receiving means for outputting a digital audio signal by selecting one of normal decoding processing and simplified decoding processing for the encoded audio data output from the receiving means, Means for determining whether the digital audio signal output from the analog / digital conversion means is in a sound state at a predetermined level or higher, or in a silent state at a predetermined level or lower, and based on the determination result of the determination means, Control means for selecting between operation and stop of the encoding means and the transmission means, and for selecting between normal decoding processing and simplified decoding processing of the decoding means And it is characterized in and.

[0011]

According to this structure, the determination means determines whether the digital audio signal output from the analog / digital conversion means is in a sound state at a predetermined level or higher or a silent state at a predetermined level or lower. If it is determined that the audio signal is in a silent state, the digital audio signal obtained by the analog / digital conversion means is encoded, and encoded audio data is output from the encoded audio data. And the transmitting means for converting the signal to a radio frequency and outputting the signal from the antenna are selected to be in an operation stop state. At the same time, in the silent state, the decoding means selects the normal decoding process.

For this reason, in the silent state, the encoding means and the transmitting means stop operating, and unnecessary surrounding noise is not transmitted to the partner terminal, but is necessary for the operation of the encoding means and the transmitting means. The power is reduced, and the decoding means performs a normal decoding process on the encoded voice data from the partner terminal.

When the determination means determines that the digital audio signal output from the analog / digital conversion means is in a sound state at a predetermined level or higher, the analog / digital conversion is performed.
An encoding unit for encoding the digital audio signal obtained by the digital conversion unit and outputting encoded audio data; an encoding unit for modulating the encoded audio data output from the encoding unit, converting the encoded audio data to radio frequency, Is selected as the operating state. At the same time, in the sound state, the decoding means selects the simplified decoding processing.

For this reason, in the voiced state, the decoding means performs a simple decoding process on the coded voice data from the partner terminal to such an extent that the user does not care about the voice quality. , The power consumption in the decoding means is reduced.

[0015]

An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a block diagram showing the configuration of the present embodiment. The same parts as those in FIG. 2 described above are denoted by the same reference numerals.

As shown in FIG. 1, in the present embodiment, a speech decoding section 8A is provided in place of the speech decoding section 8 in the conventional digital mobile radio apparatus already described with reference to FIG. A transmission silence detection unit 3A is provided in place of the detection unit 3, and the transmission silence detection unit 3A is newly connected to the speech decoding unit 8A.

The audio decoding unit 8A according to the present embodiment selects a normal decoding process or a simplified decoding process with a smaller processing amount than the normal decoding process, and can perform the decoding process. It has. Further, the transmission silence detection unit 3A of the present embodiment determines and detects a sound state and a silence state based on the level of the output signal of the A / D converter 2, and in the silence state, the transmission silence detection unit 3A has already received a command from the control unit 12. Like the transmission silence detection unit 3 described, the transmission silence detection unit 3 has a function of supplying a stop signal to the speech encoding unit 4 and the transmission unit 5 to stop the operation. Further, in the present embodiment, the transmission silence detecting unit 3A
When a sound state is determined and detected from the level of the output signal of the / D converter 2, the voice decoding unit 8A is controlled by a command from the control unit 12.
Has a function of supplying a selection signal for causing the simplified decoding process to be selectively executed.

The configuration of the other parts of the present embodiment is the same as that of the conventional digital mobile radio apparatus already described with reference to FIG.

Next, the operation of this embodiment having such a configuration will be described. At the time of a normal call, similarly to a conventional digital mobile radio apparatus, a voice uttered by a user is input from an input terminal 1, converted into a digital voice signal by an A / D converter 2, and then encoded by a voice encoding unit 4. The encoded audio data is frequency-modulated to a radio frequency band by the transmission unit 5 and output from the antenna 6. On the other hand, the radio wave received by the antenna 6 is demodulated into coded voice data by the receiving unit 7, decoded into a digital voice signal by the voice decoding unit 8A, converted into an analog voice signal by the D / A converter 10, and output. Is done.

In the silent state where the output signal level of the A / D converter 2 is low, for example, when the user is listening to the other party, only low-level ambient noise is input to the input terminal 1. The transmission silence detection unit 3A detects this silence state, and in accordance with a command from the control unit 12, transmits the transmission silence detection unit 3A.
, A stop signal is input to the speech encoding unit 4 and the transmission unit 5, and the speech encoding unit 4 and the transmission unit 5 are in an operation stop state. When a sound state where the output signal level of the A / D converter 2 is high, for example, a sound state in which a user's voice signal is input to the input terminal 1, is entered, the transmission silence detection unit 3A detects this sound state. Then, the supply of the stop signal from the transmission silence detection unit 3A to the audio encoding unit 4 and the transmission unit 5 is interrupted by a command from the control unit 12, and the selection signal is supplied from the transmission silence detection unit 3A to the audio decoding unit 8A. Is done.

For this reason, in the audio decoding unit 8A, a simplified decoding process having a smaller processing amount than that of the normal decoding process is selected by the selection signal, and the coded audio data from the partner terminal is used by the user to obtain the audio quality. Above, the simple decoding process is executed to the extent that it is not noticed.

As described above, in the present embodiment, in the silent state where the user is not talking, the voice encoding unit 4
And the operation of the transmitting unit 5 is stopped, and the surrounding noise is not transmitted unnecessarily. In this case, the reception from the partner terminal is performed as usual, and there is no obstacle to the communication using the digital mobile radio device. Does not occur. In this case, when the user starts a call, the operations of the voice encoding unit 4 and the transmitting unit 5 are restarted, and the communication state returns to the normal communication state. In the present embodiment, in the silent state, such an operation prevents wasteful power consumption in the voice encoding unit 4 and the transmitting unit 5 and makes it possible to reduce the operating power consumption of the digital mobile radio apparatus. Become.

Also, in this embodiment, when the user is talking at a signal level higher than a predetermined level, or when the user is not talking, but the surrounding noise is a sound level higher than the predetermined level, In the audio decoding unit 8A, a simplified decoding process is performed on the encoded audio data from the partner terminal to the extent that the user does not care about the audio quality, and power consumption in the audio decoding unit 8A is reduced. Be reduced. in this case,
If the user is talking on his own or the surrounding noise level is high, and the user performs a simplified decoding process with a reduced processing amount compared to the normal decoding process, the user will still have a poor quality of the received voice. Is hardly noticeable.

As described above, according to the present embodiment, the power consumption of the voice encoding unit 4 and the transmitting unit 5 is reduced in the silent state, and the power consumption of the voice decoding unit 8A is reduced in the voiced state. Thus, it is possible to efficiently communicate with the partner terminal while maintaining the voice quality required for communication.

[0026]

According to the present invention, in a silent state in which the transmission voice level at the user terminal is low, the encoding means and the transmission means stop operating, and unnecessary surrounding noise is transmitted to the partner terminal. On the other hand, the decoding means performs a normal decoding process on the encoded voice data from the other terminal, and in a state where the power required for the operation of the coding means and the transmitting means is reduced, Communication with high-quality sound quality is performed between the user terminal and the mobile terminal. On the other hand, in a voiced state in which the transmission voice level of the user terminal is high, the encoded voice data from the partner terminal is
In the decoding means, simplification processing is performed, and in a state where the operating power of the decoding means is reduced, communication with sound quality of a quality which is not noticeable to the user is performed with the partner terminal,
In both the silent state and the sound state, communication with good sound quality can always be performed with the partner terminal while power consumption is significantly reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a conventional digital mobile radio apparatus.

[Explanation of symbols]

 Reference Signs List 2 A / D converter 3A Transmission silence detecting unit 4 Audio encoding unit 5 Transmitting unit 6 Antenna 7 Receiving unit 8A Audio decoding unit 10 D / A converter

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04B 1/38-1/58 H04B 7/24-7/26 H04M 1/00 G10L 3/00-9 / 20 H04Q 7/00-7/38

Claims (2)

(57) [Claims] 1. An analog / digital converter for converting an analog audio signal into a digital audio signal, and an encoder for encoding the digital audio signal converted by the analog / digital converter and outputting encoded audio data. Transmitting means for modulating the coded voice data output from the coding means, converting the coded voice data to radio frequency and outputting from the antenna, and converting the signal received by the antenna to baseband and demodulating the coded voice data Receiving means for performing a decoding process by selecting one of a normal decoding process and a simplified decoding process for the encoded voice data output from the receiving device, and outputting a digital voice signal And a digital sound signal output from the analog / digital conversion means is in a sound state at a predetermined level or higher, or in a silent state at a predetermined level or lower. Determining means for determining whether or not the encoding means and the transmitting means are to operate or stop operating based on the determination result of the determining means; and the normal decoding processing and the simplified decoding processing of the decoding means are performed. Control means for selecting a digital mobile radio device. 2. The digital mobile radio apparatus according to claim 1, wherein the amount of decoding processing in the simplified decoding processing is smaller than that in the normal decoding processing so as to cause no problem in sound quality.